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I found something. Maybe it's for you. Validation OS 26100.3624.250321-2034, https://learn.microsoft.com/en-us/w...esktop/validation-os-overview?view=windows-11. It's free, there is an URL inside of link above to download source ISO. No GUI, command line only. No any limitations for usage and for hardware to install as I know. https://learn.microsoft.com/en-us/w...esktop/validation-os-overview?view=windows-11 It is the documentation from Microsoft for Validation OS It can be downloaded as PDF file too. https://learn.microsoft.com/en-us/w...sktop/validation-os-customize?view=windows-11 It is MS documentation of Validation OS generation and customization using Validation OS Image Builder https://learn.microsoft.com/en-us/w...idation-os-customize-advanced?view=windows-11 the same but using another tool, GenImage (Advanced) Download ISO https://aka.ms/DownloadValidationOS https://forums.mydigitallife.net/threads/discussion-microsoft-validation-os.85484/ https://software-static.download.pr...50.ni_release_amd64fre_en-us_VALIDATIONOS.iso ISO contains folders tree – the source for generation WIM file from scratch. Microsoft states that this WIM may be used as WinPE or can be installed to HDD/SSD as bootable OS. It is the most compact Windows OS as I ever seen.

I missed something. I apologize for that. I thought Defender should be uninstalled, not updated. Would you please help me to understand. Thank you.